Celebrity trainer Harley Pasternak who's trained Alicia Keys, Eva Mendes, and Halle Berry has a little tip for us when it comes to strength training. He recommends a one sided workout like this: "Work with only one arm or one leg at a time when strength training with dumbbells. This way, while you're resting one side of your body you'll keep the other side going strong."
I love this idea of focusing on one side at a time. In some exercises, you can cheat by letting your dominant side do the brunt of the work, so this technique allows you to concentrate on strengthening both sides equally. This workout may take you twice as long, but Harley assures that "your heart will also have to keep pumping hard through your entire workout, which means that you'll actually burn more calories overall." Give it a try the next time you strength train.